What's the number under the social security card?

The bar code is a long bar code. The following 12 digit cannot be called 12 digit, because the last digit is S. Students who have never studied English should pay attention. Remember, the last number is the capital letter s, which can't be used if it is spelled as S.

Further reading: How to buy insurance, which is good, and teach you how to avoid these "pits" of insurance.